Microstructure and Catalytic Activity of Melt Spun Al-Cu-Fe Ribbons

Abstract

The Al65Cu20Fe15 (in at.%) rapidly solidified ribbon in the form of brittle flakes was produced by melt-spinning technique. It consists the cell or dendrites of the icosahedral quasicrystalline I-phase surrounded by copper rich cubic τ-Al(Cu, Fe). The pulverized ribbon (fraction <32 μm) was subjected to NaBH4 or 20% aqueous NaOH treatment, which led to the formation of oxide in the form of thin flakes at the outer layer of the powder particles. Test of the catalytic properties of the as spun ribbon and powder before and after treatment was made in the reaction of phenylacetylene hydrogenation. It was shown that for as received ribbon, even at very mild conditions (60 °C, H2 pressure of 5 bar), 40% of phenylacetylene was converted to hydrogenation products with 0.7 styrene/ethylbenzene ratio. The use of pulverized ribbon resulted in improvement of activity, with the same ratio of reaction products. The effect of treatment with NaBH4 led to improvement of the catalyst activity, while strongly alkaline solution of NaOH worsened significantly the catalytic activity, but improved selectivity to styrene (styrene/ethylbenzene=1.2).

Microstructure and Catalytic Activity of Al13Fe4 and Al13Co4 Melt-Spun Alloys

“…The presented preliminary studies of catalytic properties are promising and will be continued. Similarly, to the tested AlCuFe and nickel-base alloys (Czaja et al, 2020;Lityńska-Dobrzyńska et al, 2020), it can be expected that appropriate surface treatment by leaching will result in an improvement in activity and selectivity.…”

Microstructure and Corrosion Behavior of Al-Cu-Fe Quasi-crystalline Coated Ti-6Al-4V Alloy

“…The performance of wear resistance for the Al-Cu-5Fe coating was 2.8 times that of the substrate. Although QCs have limited applications as structural materials due to their brittle nature, their distinctive characteristics raise the possibility of applications as functional materials in several fields such as a catalytic agent to produce hydrogen [3,4].…”

Structural Characterization of Al65Cu20Fe15 Melt-Spun Alloy by X-ray, Neutron Diffraction, High-Resolution Electron Microscopy and Mössbauer Spectroscopy

“…The atomic fraction of Al-Cu-Fe alloys for which the icosahedral quasicrystalline structure can be obtained is given in the range: 23.4–25.1% Cu, 12.6–13.7% Fe, and 62.3–62.9% Al for conventionally casted alloys, 12.7–18.3% Cu, 14.7–19.6% Fe, and 63.3–68.6% Al for melt-spun ribbons, and 15.2–19.9% Cu, 14.2–18.6% Fe, and 62.3–68.3% Al for atomized powder [ 15 ]. The potential applications of quasicrystalline aluminum alloys with the addition of copper and iron include catalysts, elements of devices used in thermometry to detect heat flow, light absorbers in solar cells, element of bolometers in the detection of infrared radiation, and coating materials, for example in car engine pistons [ 16 , 17 , 18 ].…”